空间刚架结构对地震响应的有限元分析

本文详细地讨论了空间刚架结构对地震载荷随机动力响应的有限元分析以及空间刚架和平面刚架对地震响应的区别和联系。结果表明:当空间刚架结构受某一方面地震荷载的单独作用时,位移的响应值与载荷保持线性关系。相对而言,结构的竖向位移响应是很微弱的,结构对竖向地震载荷的响应也很小。当互相耦合的两个水平地震共同作用时,位移的响应值与载荷将不再保持线性关系。再者,不同的基础约束所得到的响应值是有很大的差别的。此外,空间刚架结构的侧向约束刚度趋于无穷时,将得到与平面刚架结构相一致的结果。

Finite Element Analysis of Responses by Spatial Rigid-frame Structures to Quakes

A detailed finite element analysis is made of the stochastic responses of spatial rigid-frame structures to quake loads. Also investigated are the difference and relationship between responses to quakes by spatial rigid frames and those by planar rigid frames. As shown by the results, when spatial rigid-frame structures are subjected to quake loads from one direction alone , a linear dependence is found of the displacement rosponses on the loads, the vertical displacement responses and the responses to vertical loads being both minute, when two coupled horizontal quakes work together on rigid frames, no more of the linear dependence can be found; response values of considerable difference are obtained with different base constraints present, and when the lateral restraint stiffness of a spatial rigid-frame structure tends to infinite, no difference will be found between the results and those in the case of a planar one